VSt3sp (St3sp)

bearing elements of welded and non-welded structures and components operating at positive temperatures. Shaped and sheet products (category 5) — for the bearing members of welded structures operating under variable loads: rolled at a thickness up to 25 mm in the temperature range from -40 to +425 ° C; rolled at a thickness of over 25 mm — from -20 to +425 ° C, provided with a guaranteed delivery weldability.

Classification

Country Section Category
CIS, Russia, Ukraine Structural steel Carbonaceous structural steel of ordinary quality

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Cu, % Ni, % As, % P, % C, % S, %
GOST 380-2005 97.76–99.34 0.12–0.3 0.4–0.65 < 0.3 < 0.3 < 0.3 < 0.08 < 0.04 0.14–0.22 < 0.05

Information on suppliers

Physical characteristics

Temperature, °C E\cdot 10^{9}, MPa \rho, \frac{kg}{m^3}
20 194 7850
100 192
200 187
300 183
400 178
500 167
600 159
700 146
800 120
900 99

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers \sigma _{U}, MPa \sigma_{P}, MPa \epsilon_L, % \psi, % KCU\cdot 10^{3}, \frac{J}{m^2} Treatment
Forgings < 100 353 175 28 55 640 Normalization
Forgings 100–300 353 175 24 50 590 Normalization
Rental hot rolled. < 20 370–480 245 26 delivery condition

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
no limits not sensitive not inclined

Critical point temperatures

Ac1, K Ac3(Acm), K Ar3(Arcm), K Ar1, K
735 850 835 680

Analogues

Germany USA
RSt37-2 A570-36

Standards

Standard Description
GOST 380-2005

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
Cu % Copper
Ni % Nickel
As % Arsenic
P % Phosphorus
C % Carbon
S % Sulfur

Description of physical characteristics

Parameter Units of measurement Description
E\cdot 10^{9} MPa Elastic modulus
\rho \frac{kg}{m^3} The density of the material

Description of mechanical properties

Parameter Units of measurement Description
\sigma _{U} MPa Ultimate tensile strength
\sigma_{P} MPa Proportionality limit
\epsilon_L % Elongation at break (longitudinal)
\psi % Reduction in cross section on fracture
KCU\cdot 10^{3} \frac{J}{m^2} Impact toughness

Designation of types of weldability

Parameter Units of measurement Description
no limits Welding is performed without heating and without subsequent heat treatment
Boundedly welded Welding is possible with heating up to 100–120 °C and subsequent heat treatment
Difficult to weld For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing
Not applicable for welded structures

Description of temperatures of critical points

Parameter Units of measurement Description
Ac1 K
Ac3(Acm) K
Ar3(Arcm) K
Ar1 K